EP1590308B1 - Procedes de cimentation a mettre en oeuvre dans des formations souterraines utilisant de compositions de ciment renfermant des billes creuses souples - Google Patents

Procedes de cimentation a mettre en oeuvre dans des formations souterraines utilisant de compositions de ciment renfermant des billes creuses souples Download PDF

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EP1590308B1
EP1590308B1 EP04700724.0A EP04700724A EP1590308B1 EP 1590308 B1 EP1590308 B1 EP 1590308B1 EP 04700724 A EP04700724 A EP 04700724A EP 1590308 B1 EP1590308 B1 EP 1590308B1
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Prior art keywords
beads
cement
flexible
cement composition
fluid
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German (de)
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EP1590308A1 (fr
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B. Raghava Reddy
Krishna M. Ravi
Michael J. Szymanski
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Halliburton Energy Services Inc
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Halliburton Energy Services Inc
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02Treatment
    • C04B20/04Heat treatment
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04Macromolecular compounds
    • C04B16/08Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04Macromolecular compounds
    • C04B16/08Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons
    • C04B16/082Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons other than polystyrene based, e.g. polyurethane foam
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0016Granular materials, e.g. microballoons
    • C04B20/002Hollow or porous granular materials
    • C04B20/0032Hollow or porous granular materials characterised by the gas filling pores, e.g. inert gas or air at reduced pressure
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/42Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
    • C09K8/46Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
    • C09K8/467Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
    • C09K8/473Density reducing additives, e.g. for obtaining foamed cement compositions
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Definitions

  • This invention generally relates to cementing in subterranean formations penetrated by well bores.
  • Well cementing is a process used in penetrating subterranean zones (also known as subterranean formations) to recover subterranean resources such as gas, oil, minerals, and water.
  • a well bore is drilled while a drilling fluid is circulated through the well bore.
  • the circulation of the drilling fluid is then terminated, and a string of pipe, e.g., casing, is run in the well bore.
  • the drilling fluid in the well bore is conditioned by circulating it downwardly through the interior of the pipe and upwardly through the annulus, which is located between the exterior of the pipe and the walls of the well bore.
  • primary cementing is typically performed whereby a slurry of cement and water is placed in the annulus and permitted to set into a hard mass (i.e., sheath) to thereby attach the string of pipe to the walls of the well bore and seal the annulus.
  • a hard mass i.e., sheath
  • Low density or lightweight cement compositions are commonly used in wells that extend through weak subterranean formations to reduce the hydrostatic pressure exerted by the cement column on the weak formation.
  • Conventional lightweight cement compositions are made by adding more water to reduce the slurry density.
  • Other materials such as bentonite, diatomaceous earth, and sodium metasilicate may be added to prevent the solids in the slurry from separating when the water is added.
  • this method has the drawback that the addition of more water increases the cure time and reduces the strength of the resulting cement.
  • Lightweight cement compositions containing hollow spheres have been developed as a better alternative to the cement compositions containing large quantities of water.
  • the hollow spheres are typically cenospheres, glass hollow spheres, or ceramic hollow spheres.
  • Cenospheres are hollow spheres primarily comprising silica (SiO 2 ) and alumina (Al 2 O 3 ) and are filled with gas. Cenospheres are a naturally occurring by-product of the burning process of a coal-fired power plant. Their size may vary from about 10 to 350 ⁇ m.
  • These hollow spheres reduce the density of the cement composition such that less water is required to form the cement composition. The curing time of the cement composition is therefore reduced.
  • the resulting cement has superior mechanical properties as compared to cement formed by adding more water. For example, the tensile and compressive strengths of the cement are greater.
  • cementing compositions and applications of such compositions in subterranean formations are described in FR 2787441 , US 5779787 and GB 2354236 .
  • the cement sheath is subjected to detrimental cyclical stresses due to pressure and temperature changes resulting from operations such as pressure testing, drilling, fracturing, cementing, and remedial operations.
  • Conventional hollow spheres suffer from the drawback of being brittle and fragile and thus often cannot sustain those cyclical stresses.
  • the present disclosure relates to cement compositions that can withstand the cyclical stresses that occur during the life of the well.
  • the present invention relates to a method for cementing a well bore in a subterranean formation using cement compositions comprising hydraulic cement, water and one or more flexible beads: wherein the flexible beads are hollow, having an elastomeric, flexible outer wall and filled with a fluid, wherein in response to changes in pressure, temperature or both, the fluid expands or contracts thereby causing the elastomeric, flexible outer wall of the bead to likewise expand or contract. More specifically, the present invention relates to a method of cementing in a subterranean formation comprising the steps of:
  • a relatively lightweight cement composition is formed by combining flexible, compressible beads with a hydraulic cement and a fluid such as water.
  • Any suitable flexible, compressible bead that may expand and contract and that is compatible with a cement (i.e., chemically stable over time upon incorporation into the cement) may be combined with the cement to reduce its density.
  • Flexible bead as used herein refers to a bead that may expand and contract without adverse effect to the structure of the bead in response to changes in pressure and/or temperature.
  • Preferred flexible, compressible beads are substantially hollow objects filled with fluid (preferably gas), preferably spherical or substantially spherical in shape, and having a flexiblen outer wall.
  • Preferred flexible, compressible beads have a diameter of about 6 to 150 micrometers at 25°C and atmospheric pressure.
  • the fluid inside the flexible, compressible beads is air, carbon dioxide, an inert gas such as nitrogen, or an organic liquid with a low boiling point such as n-butane, isobutane or pentane.
  • the flexible, compressible beads have a substantially uniform, flexible outer wall comprising of one or more elastomeric materials or polymers.
  • the temperature at which the elastomeric material melts or becomes so soft that it loses its ability to contain the fluid and/or expand and contract is desirably higher than the temperature in the well bore, which may range from about 120°F (49°C) to about 400°F (204°C).
  • the elastomeric material is preferably a styrenic polymer, more preferably a copolymer of methylmethacrylate and acrylonitrile or a terpolymer of methylmethacrylate, acrylonitrile, and vinylidene dichloride.
  • Flexible, compressible beads composed of this copolymer and this terpolymer are commercially available from Akzo Nobel, Inc., which is located in Duluth, Georgia, under the tradename EXPANCEL.
  • EXPANCEL Several grades of EXPANCEL beads are available and may be selected depending upon the degree of expansion, the physical state, and the temperature range for a given application.
  • Suitable materials that may be used to form the flexible wall include, but are not limited to, a styrene-divinylbenzene copolymer and polystyrene.
  • Hollow polystyrene beads are available from many polystyrene suppliers, such as Huntsman Corporation of Houston, Texas (sold as GRADE 27, GRADE 51, or GRADE 55) and BASF Corporation of North Mount Olive, New Jersey (sold under the tradename STYROPOR).
  • the flexible, compressible beads are incorporated into the cement in a concentration of preferably from about 1% to about 200% by weight of the cement (bwoc), more preferably from about 2% to about 100%, and most preferably from about 5% to about 50%.
  • the flexible, compressible beads may be expanded before mixing with the cement by heating the flexiblen, compressible beads to soften the wall of the bead and to increase the pressure of the fluid (e.g., gas) therein.
  • Preferred flexible, compressible beads are capable of expanding up to 8 times their original diameters (i.e., the diameter at 255°C and atmospheric pressure).
  • EXPANCEL beads having a diameter in the range of 6 to 40 microns, upon expansion increase to a diameter of 20 to 150 microns. When exposed to heat, the beads can expand up to forty times or greater their original volumes. The expansion of the beads is generally measured by the decrease in the specific gravity of the expanded material.
  • the density of the beads decreases from 1,000 grams per liter for the unexpanded beads to about 30 grams per liter for the expanded beads.
  • the temperature at which the flexible, compressible beads are heated depends on the polymer composition of the bead wall and the desired density of the cement composition, which is typically in a range of from about 6 (0.72) to about 23 (2.76) lb/gal (kg/L).
  • the flexible, compressible beads may be added to the cement composition by dry blending with the cement before the addition of a fluid such as water, by mixing with the fluid to be added to the cement, or by mixing with the cement slurry consecutively with or after the addition of the fluid.
  • the beads may be presuspended in water and injected into the cement mix fluid or into the cement slurry as an aqueous slurry.
  • Surfactants may be added to the composition to water-wet the surface of the beads so that they will remain suspended in the aqueous phase even if the density of the beads is less than that of the water.
  • the surfactant are preferably nanionic, with a Hydrophile-Lipophile Balance values in the range 9-18.
  • the ability of a surfactant to emulsify two immiscible fluids, such as oil and water, is often described in terms of Hydrophile-Lipophile balance (HLB) values.
  • HLB Hydrophile-Lipophile balance
  • surfactants with higher HLB values are more hydrophilic than those with lower HLB values. As such, they are generally more soluble in water and are used in applications where water constitutes the major or external phase and a less polar organic fluid constitutes the minor or internal phase.
  • surfactants with HLB values in the range 3-6 are suitable for producing water-in-oil emulsions, whereas those with HLB values in the 8-18 range are suitable for producing oil-in-water emulsions.
  • HLB 20 ⁇ M H / M H + M L
  • M H is the formula weight of the hydrophilic portion of the molecule
  • M L is the formula weight of the lipophilic portion of the molecule.
  • ⁇ 1 is the weight fraction of surfactant # 1 in the total mixture
  • HLB 1 is the calculated HLB value of surfactant #1
  • ⁇ 2 is the weight fraction of surfactant #2 in the total surfactant mixture
  • HLB 2 is the calculated HLB value of the surfactant #2, and so on.
  • a mixture of a preferentially oil-soluble surfactant and a preferentially water-soluble surfactant provides better and more stable emulsions.
  • non-ionic ethoxylated surfactant mixtures containing from about 4 to about 14 moles of ethylene oxide.
  • the HLB ratio for a single surfactant or a surfactant mixture employed in the present invention preferably ranges from about 7 to about 20, more preferably from about 8 to about 18.
  • a cement slurry densified by using a lower water to cement ratio is lightened to a desired density by the addition of unexpanded or pre-expanded flexible, compressible beads in order to make the final cement less brittle.
  • hollow, non-flexible beads are mixed with the cement and the flexible, compressible beads.
  • Particularly suitable non-flexible beads are cenospheres, which are commercially available from, for example, PQ Corporation of Valley Forge, Philadelphia under the tradename EXTENDOSPHERES, from Halliburton Energy Services Inc. under the tradename SPHERELITE, and from Trelleborg Fillite Inc. of Atlanta, Georgia under the tradename FILLITE.
  • the non-flexible beads may be glass beads or ceramic beads.
  • the non-flexible beads, particularly the industrial waste product of the cenosphere type are relatively inexpensive as compared to the polymeric flexible, compressible beads. However, the non-flexible beads are more likely to break when subjected to downhole temperature and pressure changes and provide brittle cement compositions.
  • the flexible, compressible beads protect the ensuing hardened cement from experiencing brittle failure during the life of the well even if some of the non-flexible beads collapse. That is, the flexible wall and the gas inside of each bead contracts under pressure and expands back to its original volume when the pressure is removed, thus providing a mechanism for absorbing the imposed stress.
  • the absorption of energy by the flexible wall is expected to reduce the breakage of the more brittle beads when such compositions are used.
  • the flexible wall and the enclosed fluid also expand when the temperature in the well bore increases, and they contract when the temperature decreases. Further, the flexible, compressible beads improve the mechanical properties of the ensuing cement, such as its ductility and resilience.
  • Cement comprising flexible, compressible beads gains the following beneficial physical properties as compared to the same cement composition without the flexible, compressible beads: lower elastic (Young's) modulus, greater plastic deformation, increased tensile strength, and lower Poisson's ratio without significantly compromising other desirable properties such as compressive strength.
  • the additional costs incurred by using the flexible, compressible beads should be weighed against the benefits provided by using the flexible, compressible beads.
  • the amount of flexible, compressible beads added to the cement may be in the range of from about 2% bwoc to about 20% bwoc
  • the amount of non-flexible beads in the cement may be in the range of from about 10% bwoc to about 100% bwoc.
  • the cement utilized in the present invention is hydraulic cement, composed of calcium, aluminum, silicon, oxygen, and/or sulfur, which sets and hardens by reacting with water.
  • suitable hydraulic cements are Portland cements, pozzolana cements, gypsum cements, high alumina content cements, silica cements, and high alkalinity cements.
  • the cement is preferably a Portland cement, more preferably a class A, C, G, or H Portland cement, and most preferably a class A, G, or H Portland cement. A sufficient amount of fluid is also added to the cement to form a pumpable cementitious slurry.
  • the fluid is preferably fresh water or salt water, i.e., an unsaturated aqueous salt solution or a saturated aqueous salt solution such as brine or seawater.
  • the amount of water present may vary and is preferably selected to provide a cement slurry having a desired density.
  • the amount of water in the cement slurry is preferably in a range of from about 30% bwoc to about 120% bwoc, and more preferably in a range of from about 36% bwoc to about 54% bwoc.
  • additives may be added to the cement composition for improving or changing the properties of the ensuing hardened cement.
  • additives include, but are not limited to, set retarders such as lignosulfonates, fluid loss control additives, defoamers, dispersing agents, set accelerators, and formation conditioning agents.
  • set retarders such as lignosulfonates
  • fluid loss control additives such as lignosulfonates
  • defoamers such as lignosulfonates
  • dispersing agents such as sodium sulfonates
  • set accelerators such as sodium bicarbonate
  • formation conditioning agents such as sodium bicarbonate, sodium bicarbonate, sodium bicarbonate
  • a salt such as sodium chloride may be added to the cement composition when the drilling zone has a high salt content.
  • a well cementing process is performed using the cement composition containing the flexible, compressible beads.
  • the well cementing process includes drilling a well bore down to the subterranean zone while circulating a drilling fluid through the well bore.
  • a string of pipe, e.g., casing, is then run in the well bore.
  • the drilling fluid is conditioned by circulating it downwardly through the interior of the pipe and upwardly through the annulus, which is located between the exterior of the pipe and the walls of the well bore.
  • the cement composition comprising flexible, compressible beads is then displaced down through the pipe and up through the annulus) where it is allowed to set into a hard mass.
  • the cement composition may be used for other projects such as masonry or building construction.
  • a cement slurry containing EXPANCEL flexible, compressible beads in accordance with the present invention was formed by mixing together the following components according to the procedure described in American Petroleum Institute (APT) Specification 10, 5th Edition, July 1, 1990 : class H cement, water (117.20% bwoc); SILICALITE silica fume (16.9% bwoc); bentonite (4.0% bwoc); HALAD-344 fluid loss additive available from Halliburton Energy Services (0.5% bwoc); SCR-100 cement set retarder available from Halliburton Energy Services (0.3% bwoc); sodium chloride (18% bwoc); and defoamer (0.025 gal/sk) (0.6mL/kg).
  • API American Petroleum Institute
  • a portion of the cement slurry was then poured into 2"x2"x2" (5.1cmx5.1cmx5.1cm) brass cube molds and cured at 135°F (57.2°C) in a pressure chamber under a pressure of 5,200 psi (35.82MNm/m 2 ).
  • Another portion of the slurry was poured into 1"x2" (2.5cmx5.1cm) cylindrical steel molds and cured at the same temperature.
  • the compressive strengths were measured on 2"x2"x2" (5.1cmx5.1cmx5.1cm) molds using strength testing equipment manufactured by Tinius Olsen of Willow Grove, Pennsylvania, according to American Society for Testing and Materials (ASTM) procedure C190-97.
  • Example 1 The procedure of Example 1 was followed except that the EXPANCEL 53 beads were replaced with EXPANCEL 820 WU beads, which are composed of a terpolymer of methylmethacrylate, vinylidene bichloride, and acrylonitnie having a softening temperature above 167°F (75°C).
  • Example 1 The procedure of Example 1 was followed except that the EXPANCEL 53 beads were replaced with EXPANCEL 551 WU beads, which are composed of a terpolymer of methylmethacrylate, vinylidene dichloride, and acrylonitrile having a softening temperature above 200°F (93°C).
  • Example 1 Example 2
  • Comparative Example 1 SPHERELITE Beads, % bwoc 55 55 55 65 EXPANCEL 53 Beads, % bwoc 10 - - - EXPANCEL 820 Beads, %bwoc - 10 - - EXPANCEL 551 Beads, % bwoc - - 10 - Slurry Density, ppg @ atm.
  • the compressive strengths of the cements containing both flexible, compressible and non-flexible beads are greater than the compressive strengths of the cement containing only non-flexible beads (Comparative Example 1).
  • the Young's Modulus values of the cements in Examples 1-3 are lower than the Young's modulus value of the cement in Comparative Example 1, indicating that replacement of a portion of the brittle beads with flexible, compressible beads decreased the brittleness and improved the resiliency of the composition. Young's Modulus measures the interparticle bonding forces and thus the stiffness of a material. As such, the cements in Examples 1-3 are less stiff than the cement in Comparative Example 1, which contains no flexible, compressible beads, and at the same time remain resilient up to higher stress levels.
  • the radial strain values at yield (i.e., the elastic limit) for the cements in Examples 1-3 are much lower than the radial strain at yield for the cement in Comparative Example 1 due to the compressible nature of the flexible hollow beads under pressure.
  • the axial strain to radial strain ratios of the cements in Examples 1-3 are higher than the axial strain to radial strain ratio of the cement in Comparative Example 1. Therefore, when axial pressure is imposed on the cement column in the well bore, the radial expansion is significantly less for the cements containing both flexible, compressible and non-flexiblen beads as compared to the cement containing only non-flexible beads because of the reduction in volume of the cements containing the compressible, flexible beads.
  • a significant radial expansion under axial stress is expected for cements containing non-flexible beads such as those described in Comparative Example 1 or in cements where water is used to decrease the density.
  • the Poisson's Ratio and Young's Modulus values at yield for the cements in Examples 1-3 tend to be lower than or comparable to those values at yield for the cement in Comparative Example 1, as shown in Table 2.
  • the total area under a load vs displacement curve reflects the ability of a material to absorb the imposed stress in the direction of displacement. Comparing the areas under the radial curves for the cement compositions in Examples 1-3 and the cement compositions in Comparative Example 1 indicates the unique advantage the addition of flexible, compressible beads provides to the cement composition.
  • the beads Due to their compressible nature, the beads absorb the axial stress without having to distribute the stress in a radial direction. As a result, the radial dissipation of imposed axial stress is significantly lower for the compositions in Examples 1-3 than for the compositions in Comparative Example 1. This result clearly indicates that during the life of the well, the imposed stresses will be primarily absorbed by the flexible, compressible beads without requiting changed dimensions to the cement columns.
  • EXPANCEL 53 WU beads were suspended in three times the volume of water compared to that of the beads, and the resulting slurry was charged into a cylindrical stainless steel can provided with a lid to which a stirring paddle was connected.
  • the slurry filled 1 ⁇ 4 the available volume in the can after the lid was fitted.
  • the can was then inserted into a heated water bath of a HOWCO cement consistometer manufactured by Halliburton Energy Services.
  • the motor in the consistometer was turned which rotated the metal can while holding the lid steady.
  • the can was disassembled, and the expanded solid therein was filtered and dried in open air at ambient temperature. This procedure was repeated at different heating temperatures and times to obtain expanded beads of different specific gravities.
  • a cement slurry having a density of 11.3 pounds per gallon (1.35 kg per Litre) was prepared according to the API procedure mentioned previously by mixing class C cement with water (57% bwoc), SILICALITE fumed silica (15% bwoc), CFR-3 dispersant supplied by Halliburton Energy Services (2% bwoc), the EXPANCEL 53 WU beads of specific gravity 0.3 pre-expanded as described above (9.8% bwoc), the EXPANCEL 53 WU beads of specific gravity 0.1 pre-expanded as described above (2.6% bwoc), and a defoamer (2% bwoc).
  • the slurry was poured into cylindrical plastic containers of dimensions 2" x 4" (5.1cm x 10.2 cm), closed with lids, and cured at room temperature for 24 hours until the cement slurry solidified.
  • the plastic containers were transferred to a water bath kept at 180°F (82.2°C) for 18 hours, and the samples were submitted to cyclical load/displacement studies using the equipment described in Example 1.
  • the cyclic load/displacement studies were performed by measuring the force to break an initial sample, followed by cycling the loads of subsequent samples between 20% and 90% of the load force to break the initial sample. When the load force reached the maximum or minimum value, a two second resting time was maintained before the beginning of the next cycle.
  • the axial and radial displacements were measured as a function of load force.
  • the initial compressive strengths were measured either under no confining pressure, or a confining pressure of 1000 psi (6.89 MNm/m 2 ). The results are shown in Table 4.
  • a cement slurry having a density of 12.02 pounds per gallon (1.41 kg/L) was prepared using the API procedure mentioned in Example 1 by mixing class H cement with water (54% bwoc), unexpanded hollow polystyrene beads of EPS (expandable polystyrene) grade, ethoxylated (10 moles) nonylphenol (0.04 gallon per sack of cement), and a defoamer.
  • the slurry was poured into cubic molds as described in Example 1 and cured in an autoclave at 155°F (68.3°C) for 24 hours under a pressure of 3,000 psi (20.68 MNm/m 2 ).
  • EPS grade hollow polystyrene beads of specific gravity 1.01 were heated in water to 170°F for 3 hours following the procedure described in Example 4. The expanded beads were filtered and dried. The specific gravity of the expanded beads was 0.1.
  • a cement slurry having a 12.08 pounds per gallon (1.45 kg per Litre) density was prepared as described in Comparative Example 3 except that the unexpanded hollow polystyrene beads were replaced with the pre-expanded polystyrene beads of specific gravity of 0.1.
  • the slurry was cured under the same conditions as described in Comparative Example 3.
  • the density measured after curing under pressure was 14.9 pounds per gallon (1.79 kg per Litre), clearly indicating that pre-expansion of the beads made them flexible and compressible.

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Claims (18)

  1. Procédé de cimentation dans une formation souterraine, comprenant les étapes suivantes :
    la préparation d'une composition de ciment contenant un ciment hydraulique, de l'eau et au moins une perle flexible ; les perles flexibles étant creuses, ayant une paroi externe flexible contenant au moins un matériau élastomère et étant remplies de fluide, moyennant quoi, en réponse aux variations de pression, de température ou des deux, le fluide se dilate ou se contracte, ce qui amène la paroi externe flexible de la perle à une expansion ou à une contraction ; et
    le placement de la composition de ciment dans la formation souterraine ; et le fait de laisser la composition de ciment prendre.
  2. Procédé selon la revendication 1, dans lequel le matériau élastromère est choisi dans l'ensemble constitué d'un copolymère de méthylméthacrylate et d'acrylonitrile ; d'un terpolymère de méthacrylate de méthyle, d'acrylonitrile et de dichlorure de vinylidène ; d'un copolymère de styrènedivinylbenzène ; de résines phénoliques ; et de polystyrène.
  3. Procédé selon la revendication 1, comprenant en outre l'introduction des perles dans de l'eau avant que les perles ne soient introduites dans la composition de ciment.
  4. Procédé selon la revendication 1, comprenant en outre l'introduction d'un tensioactif ou d'un mélange de tensioactifs dans la composition de ciment, ce qui amène les perles à être en suspension dans une phase aqueuse.
  5. Procédé selon la revendication 1, comprenant en outre l'expansion des perles avant l'introduction des perles dans la composition de ciment.
  6. Procédé selon la revendication 5, dans lequel l'expansion des perles comprend le chauffage des perles.
  7. Procédé selon la revendication 1, dans lequel au moins une perle flexible est à capable d'expansion jusqu'à 8 fois son diamètre initial.
  8. Procédé selon la revendication 1, dans lequel le fluide est un liquide.
  9. Procédé selon la revendication 1, dans lequel le fluide est un gaz.
  10. Procédé selon la revendication 9, dans lequel le gaz est choisi dans l'ensemble constitué d'air, de dioxyde de carbone, d'azote, de n-butane, d'isobutène, de pentane et de leurs combinaisons.
  11. Procédé selon la revendication 1, dans lequel les perles ont un diamètre compris entre environ 6 et environ 150 µm à une température de 25 °C et sous pression atmosphérique.
  12. Procédé selon la revendication 1, dans lequel les perles sont introduites dans la composition de ciment en quantité comprise entre 1 et 200 % en poids de ciment.
  13. Procédé selon la revendication 1, dans lequel les perles sont introduites dans la composition de ciment en quantité comprise entre 2 et 100 % en poids de ciment.
  14. Procédé selon la revendication 1, dans lequel les perles sont introduites dans la composition de ciment en quantité comprise entre 5 et 50 % en poids de ciment.
  15. Procédé selon la revendication 1, dans lequel la composition de ciment comprend en outre au moins soit des perles non flexibles, soit un tensioactif, soit de la fumée de silice, soit de la bentonite, soit un agent de perte de fluide, soit un retardateur de prise, soit du chlorure de sodium, soit un agent antimousse.
  16. Procédé selon la revendication 1, dans lequel la composition de ciment comprend en outre au moins soit des sphères de céramique, soit des sphères de verre, soit des cénosphères.
  17. Procédé selon la revendication 4, dans lequel le tensioactif ou le mélange de tensioactifs a un rapport HLB compris entre environ 7 et environ 20.
  18. Procédé selon la revendication 1, dans lequel la composition de ciment a une densité comprise entre 6 et 23 livres/gal (0,72 à 2,76 kg/L).
EP04700724.0A 2003-01-24 2004-01-08 Procedes de cimentation a mettre en oeuvre dans des formations souterraines utilisant de compositions de ciment renfermant des billes creuses souples Expired - Lifetime EP1590308B1 (fr)

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US10/350,533 US7543642B2 (en) 2003-01-24 2003-01-24 Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations
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US20050061206A1 (en) 2005-03-24
EP3012238A1 (fr) 2016-04-27
CA2513561C (fr) 2012-03-27
WO2004065321A1 (fr) 2004-08-05
US20040144537A1 (en) 2004-07-29
US7543642B2 (en) 2009-06-09
AR042918A1 (es) 2005-07-06
CA2513561A1 (fr) 2004-08-05
EP3012238B1 (fr) 2018-12-05
NO344261B1 (no) 2019-10-21
NO20053778L (no) 2005-08-23
EP1590308A1 (fr) 2005-11-02

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